674results about How to "Good casting performance" patented technology

The invention discloses an Al-Zn-Mg-Cu-Sc-Zr-RE alloy capable of being used as an ultrahigh-strength cast aluminum alloy and a preparation method thereof. In the alloy, Zn and Mg with higher content are adopted, Sc and Zr are compositely microalloyed, and trace rare earth elements Er and / or Yb are added, so that the aims of increasing an eutectic phase proportion, thinning a grain structure, suppressing dendritic crystal growth and changing an alloy solidification mode are fulfilled to reduce the heat cracking tendency of the alloy and obviously improve the casting performance of the alloy. The alloy comprises the following components in percentage by weight: 7.0 to 8.0 percent of Zn, 1.5 to 2.5 percent of Mg, 1.4 to 2.0 percent of Cu, 0.2 to 0.5 percent of Mn, 0.15 to 0.25 percent of Sc,0.10 to 0.20 percent of Zr, 0.1 to 0.3 percent of Er and / or Yb and the balance of Al. The as-cast alloy can achieve high toughness performance through long-time variable-temperature homogenization, enhanced solid solution treatment and aging treatment, can be used for producing an aluminum alloy casting with the yield strength of more than 500MPa and the elongation rate of more than 5 percent andcan be used as an alternate material for the ultrahigh-strength wrought aluminum alloy.

The invention discloses an Al-Si-Cu-Mg series distortion aluminum alloy and the manufacturing method. The alloy is made up from 9.0-12.0wt% Si, 3.0-4.0wt% Cu, 0.3-0.6wt% Mg, <0.30% Fe, <0.20% Zn, and other impurity <=0.15wt%, and the rest is Al. The method includes the following steps: smelting and refining the raw materials in reflecting smelter, after processing the allow liquation by Al-Sr intermediate alloy, gaining cast rod through hemicontinuous casting, extruding the cast rod and after forging and T6 thermal treatment to gain the product. The tensile strength of the alloy is over 397MPa, and broken tensile stretch is 6%, and rigidity is 136-141HB. It is mainly used to make wheel for vehicle and motorcycle, piston, bearing, bidirectional sloping cam plate, etc.

The invention provides a lead-free cutting-free alloy and a preparation method thereof. The components (weight percentage) of the alloy are: more than 97.0 but not equal to 99.5 of (copper + zinc), more than 35.0 of zinc, 0.4-1.6 of phosphor and 0.005-0.6 of at least two other elements selected from aluminum, silicon, antimony, stannum, lanthanon, titanium and boron, the balance being zinc and impurities, wherein, the zinc content is more than 35.0 (weight percentage). The invention also provides a preparation method for the lead-free cutting-free high phosphor brass alloy. The alloy of the invention has excellent machinability, castibility, welding property, dezincification corrosion resisting property, formability and mechanical property, and is particularly suitable for forged pieces and low-pressure cast castings needing cutting processing, grinding processing (polish), welding and plating, such as hydrants, valve bodies and bushings in a water supply system.

The invention discloses a high-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy and a heat treatment method. The alloy comprises the following components by mass percentage: 6.5-8.3% of Zn, 2.3-3.0% of Mg, 0.8-1.2% of Cu, 0.1-0.2% of Zr, less than 0.15% of Fe, less than 0.1% of Si, and the balance of Al. A preparation method of the alloy comprises the steps of blending, smelting, semi-continuous casting, homogenizing, thermoplastic deformation, short time solid solution, and ageing heat treatment. For the high-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy prepared with the method, the hardness (HV) is 185-209, the tensile strength sigma b is greater than or equal to 650Mpa, the percentage elongation delta is greater than or equal to 7%, the pitting resistance is high, the cast ingot yield is high, and the stress corrosion resistance is further improved while the mechanical property is kept after multiple regression reageing treatment. The alloy and the heat treatment method solve the problems that the cast ingot yield in the existing high-copper Al-Zn-Mg-Cu ultrahigh-strength aluminium alloy is low, and the strength, toughness and corrosion resistance cannot be compromised. The heat treatment method is simple to operate, and the industrial production is facilitated.

The invention relates to Cr-Mn-N austenite stainless steel. A proper amount of Mn and N are used to substitute expensive nickel to produce a novel Cr-Mn-N steel grade for reducing the cost for materials and maintaining the prior physical property and mechanical property. The Cr-Mn-N austenite stainless steel comprises the following composing elements in percentage by weight: 0.005 to 0.08 percent of carbon element, 0.3 to 0.9 percent of silicon element, 12.1 to 14.8 percent of manganese element, 0.001 to 0.04 percent of phosphorus element, 0.001 to 0.03 percent of sulfur element, 16 to 19 percent of chromium element, 0.5 to 1.8 percent of nickel element, 0.2 to 0.45 percent of nitrogen element, 0.001 to 0.3 percent of molybdenum element, 0.001 to 0.3 percent of copper element, and unavoidable trace elements during most manufacturing processes. The corrosion resistance, the strength and the elongation percentage of the Cr-Mn-N austenite stainless steel in marine atmosphere and acid atmosphere are the same as those of a 304 stainless steel material or are better than those of the 304 stainless steel material, and the Cr-Mn-N austenite stainless steel can reduce the cost for the materials. The Cr-Mn-N austenite stainless steel has the advantages of high elongation percentage, strong corrosion resistance, excellent casting formability and good high-temperature oxidation resistance.

The invention discloses a high-nickel austenitic nodular cast iron material for an automobile turbine housing and a preparation method for the high-nickel austenitic nodular cast iron material. The high-nickel austenitic nodular cast iron material comprises the following components in percentage by weight: 1.70 to 1.90 percent of carbon, 4.90 to 5.50 percent of silicon, 0.50 to 0.80 percent of manganese, less than 0.05 percent of phosphorus, less than 0.02 percent of sulfur, 0.06 to 0.09 percent of magnesium, 34.0 to 36.0 percent of nickel, 1.75 to 2.00 percent of chromium and the balance of iron. The preparation method comprises the following steps of sequentially throwing silicon carbide, cast iron, a recycled material, waste steel and pure nickel into melting equipment for melting; adding ferro-manganese, ferrochromium, ferrosilicon and a low-sulfur carburant after the materials in the melting equipment are molten; extracting the molten materials for spectral analysis; raising the temperature of the melting equipment to 1,560 to 1,620 DEG C for nodularizing treatment after the molten materials are qualified; pouring the heated materials into a nodularizing ladle for wire feeding nodularizing treatment; pouring the nodularized materials into a casting ladle for secondary inoculation, removing oxidizing slag, and performing standing and cooling; cooling and casting material liquid, and performing sand shakeout cleaning; performing heat treatment on a casting after the sand shakeout cleaning, and annealing the casting to obtain a finished product. The high-nickel austenitic nodular cast iron material is high in casting and machining performance and low in cost, and process conditions are reasonable, easy to control and favorable for casting production.

A novel scandium-containing cast aluminum-lithium alloy is disclosed. The alloy includes, by weight, 1.6-1.99% of Li, 0.9-1.9% of Cu, 0.2-0.7% of Mg, 0.1-0.25% of Zr, 0.05-0.35% of Sc, and impurity elements which are Fe, Si, Na, K and P, with the balance being Al, with the Fe content being less than 0.15% and the total content of the impurity elements being less than 0.25%. During preparation, Al-Cu and Al-Zr master alloys, pure aluminum, pure Mg and pure Li are smelted to obtain an aluminum alloy; then three stages of solid solution heat treatment are performed including solid solution heat treatment at 440-460 DEG C for 32 h, solid solution heat treatment at 510-520 DEG C for 24-32 h and solid solution heat treatment at 530-540 DEG C for 1-6 h; and after water quenching, artificial ageing treatment at 150-190 DEG C is performed for 16-48 h to obtain the novel scandium-containing cast aluminum-lithium alloy. The obtained novel scandium-containing cast aluminum-lithium alloy has a uniform microscopic structure, stable performance, density lower than density of traditional aluminum alloys, higher elastic modulus and rigidity, and other mechanical properties, and is low in cost. Theultimate tensile strength of the novel scandium-containing cast aluminum-lithium alloy can be 450-490 MPa and the specific elongation is 4.5-7.0%.

The invention relates to the field of leadless brass alloy and especially to an easily-cuttable corrosion-resistant high-zinc leadless brass alloy and a preparation method thereof. The alloy can be used to substitute machined lead brass alloy and is an excellent environment-friendly green metal material. The alloy comprises 57 to 63% of copper, 1 to 1 .5% of graphite, 0.05 to 2% of titanium, 0.001 to 0 .05% of aluminum, 0.001 to 0 .05% of boron, 0.02 to 0.06% of arsenic, 0.2 to 0.5% of iron, 0.1 to 0 .2% manganese and 0.001 to 0.07% of a rare earth element RE, with the balance being zinc. During melting, copper zinc alloy is melted at first, graphite and copper titanium intermediate alloy are added after copper zinc alloy is completely molten and are uniformly mixed with molten copper zinc alloy under stirring, then intermediate alloy of aluminum, boron, arsenic, iron, manganese and the rare earth element are sequentially added, stirring and slag removal are carried out, and gravity casting is carried out on an obtained mixture after flaming so as to prepare alloy cast ingots. According to the invention, graphite is added into the high-zinc leadless brass alloy to substitute lead,which enables the high-zinc leadless brass alloy to cost less compared to bismuth brass, the disadvantages of cracks, inclusion and the like of castings to be reduced, brass crystal grains to be refined and the high-zinc leadless brass alloy to have excellent hot and cold processing performances.

The invention discloses an inner supporting body for a run-flat tire, which is characterized in that: the inner supporting body is made of a magnesium alloy serving as a raw material, and adopts a two-block split structure; the split parts comprise a main body and a joint respectively; and the joints between the split parts are connected by a connection piece. The inner supporting body has the advantages of high rigidity, good heat stability and light weight, and the inner supporting body adopts the magnesium alloy to improve the radiating condition fundamentally, prevent rubber and engineering plastics from softening due to quick and massive deformation, eliminate the ,thermal explosion, phenomenon in the process of using the inner supporting body, improve the safe driving distance after a vehicle has a flat tire, and prolong the service life.